Flew in a few weeks back having telephoned and got a slot. Movements on arrival were minimal. Booked a slot to leave before having something to eat and on departure traffic was again minimal. Really couldn't see the need for slots. We did notice on the grass taxiway that there were several deep ruts and pointed this out to the AFISO. He told us that a vehicle had got mired there. However nobody had bothered to repair the taxiway. A prop strike was a real possibility for the unwary. All in all a good airfield to visit though.